The Zoo collection is dynamic. It is not possible to anticipate all the answers that your students might have to the questions posed on the Activity Sheets but the following "answers" will provide some help to educators.

Note: These may not be the only answers your students find. You may have to check their answers with a reliable reference source.

For mating - treefrogs are tiny and well hidden by the forest environment. Trees absorb or muffle sound; a big voice allows the frog to be heard over the other sounds of the forest so that other frogs of his species know where he is.

a) Fish need to communicate for the same reasons as other animals: to mark territory to find a mate, to warn others of its kind about danger.
b) Fish communicate in a variety of ways: chemical, tactile, acoustic and visual. Fish can inform others of their territory by secreting chemicals from certain glands. Chemical communication also includes the use of pheromones. Female fish produce pheromones that tell a male fish they are ready for mating. Visual means of communication are unique to each species, but can include movements, shape, or colour patterns.

Amphibians start to call later in the season as you move north because of the seasonal differences. By having different mating periods each species has its own niche, for example, early season breeders may be able to make use of temporary ponds that later breeders wouldn't have available to them, or their young may emerge at slightly early or later, therefore having access to a different type of food.